Wall plate structure for furnaces



June 28, 1932. H. c. LORD WALL PLATE STRUCTURE 'FOR FURNAcEs Original Filed June 20, 1930 2 SheetS-Sheeb l` H. C. LORD WALL PLATE STRUCTURE FOR FURNACES g June 28, 1932.

original Filed June 2o, 1930 sheets-sheet Patented June 28, 1932 UNITED vSTATES PATENT onirica (f HUGH C. LORD, OF ERIE, PENNSYLVANIA, ASSIGNOR' 'IOV ERIE CITY IRON WORKS,

ERIE, PENNSYLVANIA, A` CORPORATION 0F PENNSYLVANIA 'W' ALL ELATE STRUCTURE FOR FURNACES Original application led June 20, 1930, SeralvNo. 462,614. Divided and this application led July 11,

The present invention is a division of application filed by me, June 20th, 1930, Serial Number 462,614; and is designed to simplify the forming of furnace plates and the structure arising therefrom. It is particularly directed to a form of furnace in which some of the walls of the furnace form walls of a superimposed boiler, the side plates of the furnace forming the inside plates of water legs. In fabricating the boiler furnaces for this combined furnace and boiler it is common to form the crown sheet of the furnace with the side walls of the furnace. In order that different lengths of furnace may be formed it is desirable that ythe side plates be kept below the crown sheet so that in bending the crown sheet regardless of the length of the furnace to be formed the side plates will not interfere with the easy bending, or forming of the crown sheet. It is also desirable to provide such a furnace with a return flow projection which extends upwardly from the rear of the furnace chamber, the front of this projection being provided with a iue sheet from which the flues pass through the boiler. The simplicity in the forming of these sheets and a reduction in the length of joints, usually welded joints, is particularly desirable. The present construction accomplishes this purpose in a very simple and convenient manner. Features and details of the invention will appear from the specification and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings as follows Fig. l shows a central vertical section through the furnace and boiler.'

Fig. 2 a section on the line 2 2 in Fig. 1.

Fig. 3 a section on the line 8-3 in Fig. 1.

Fig. 4 a detached viewkof the crown Vsheet with its depending sides. Y

' Fig. 5 a detached view of the upper rear flue sheet.

Fig. 6 a perspective view of the rear plate of the furnace chamber.

Fig. 7' a detached view of the outer plate forming the rear water leg.

Fig. `8 a perspective vview of the bottom rear flue sheet.

Fig. 9 a perspective view of the, crown Serial No. 550,129. Y

the bottom of the'boiler, these iues extendj ing from a lower rear flue sheet 10 through a front flue sheet 12 arranged in a front smoke box 13. Rearwardlyextending flues 111 'extend from the smoke box 13 through an upper Hue sheet 15 and discharge Yto a rear smoke box 16 and from this to a stack connection 17. The rear flue sheet 10 forms the front wall ofja return flue projection 11 extending upwardly from the body of the furnace. horizontal having "rounded corners 20 leading to the side wall portion. 'The side walls extend somewhatV to the rear of the crown `sheet 2. The flue sheet 10 has its lower edge i 19 conforming to the contour ofthe crownV sheet 2 including the rounded portion 20. Side walls 2.1` for thereturn flue'projection .l1 are formed by rearwardly bent portions atV theends of the flue sheet. The lower edges 22 of the sidewalls 21 abut the upper edges 23 ofthe part ofthe sidewall 3 extending to the rear of the` crown sheet. The edge 19 is preferably welded to themrearfend of the crown sheet and the edge 22welded Vto the edge23 ofthe side walls. c A rear wall 24: closes the furnace. y It Ahas a vertical portion which extends to the bottom of the furnace and an upper portion 26 which is curvedforwardly,` the forward edge 27 of the upper portionmeeting with and.

joining the upper edge 29 of the flue sheet 10.

YThe side edges 'of the `plate 24 are joined with the edges 21a of the side plates 21 and the edges of the portion 25 are joined with the vertical part of the side plate 21T and the The crown sheet 2 is substantially eok bfi

rear end. of the side walls 3. These joints are n closedand completed by welding. a f;

Y fito The upper rear tube sheet 15 has its upper cylindrical edge 30 connected with the upper portion 5 of the plate 4 and its sides connected with the side walls @of the plate 4L. The lower edge 31 of this upper rear flue sheetis connected with the upper edge 32 of the rear water leg plate 33, this plate having a flange 34 at its lower end closing the bottom of` the water leg, the side edges of this rear water leg plate being connected to the outer shell and being within a plate 17a forming the outer wall of the smoke box 16.

It will be noted that there is no obstruction on the rear end of the side wall 3 to in-Y terfere with the easy bending of the portions, whether this is done in a press, or by a bending machine. Connecting theflue sheet with the side walls 2l eliminates a weld at the corner between the ue sheet and the side walls. The total welding lines are very materially reduced. The openings in the rear iiue sheet are arranged in a comparatively small plate andY in a plate that may be preformed before these openings are made and at any rate is small enough to be readily fashioned. The rear closure plate is of simple construction and again forms convenient joints with the adjacent parts.

' What I claim as new is l. A plate wall for furnaces of the class described comprising a main sheet forming a crown sheet with depending sides; a flue sheet extending upwardly from the rear end of the crown sheet and having return projection sides extending rearwardly fromI the `flue sheet andjoining the main sheet sides; and a rear plate closing the rear wall and having a Aforwardly extending upper part having its forward edge ljoined with the top of the fluesheet and the'side edges of the upper part joining with the top and rear of the return projection sides.

2. Aplate wall for furnaces of the cla-ssy described comprising a main sheet forming acrown sheet with` depending sides, the connection between the depending sides and crownbeing curved; a flue sheet extending upwardly from the rear end of the crown sheet and having its lower edge conforming to ythe sheet of' the crown sheet with the curved connections, said ue sheet having return projectionsides extending rearward'- ly from the flue sheet and joining the main sheet sides; and a rear plate closing the rear wall and having a'vforwardly extending upper part having its forward edge joined with the top of the lflue sheet and the side edges of the upper part joining with the top and rear of the return'projection sides. v Y

3. A plate wall for furnaces of the class described comprising4 a main sheet forming acrown sheet with depending sides, the depending'sides extending to therear of the crown sheet; a iue sheet extending upwardly from the rear end of the crown sheet and hav ing return projection sidesextending rearmy, handc HUGH C. LORD. 

